Roller-platen for type-writing machines.



F. DOW D. ROLLER PLATEN FOR TYPE WRITING MACHINES.

APPLICATION FILED AUG.B, 1913.

Patented N 0v. 10, 1914 IHI .......................... it WATT-Fe t Zlll'fi'l/ Y w 4 O T/ FRANK DOFJD. OF CLEVELAND. OHIO.

Specification of Letters Pa tent.

llatented Nov. 10, 1914.

Application lilcd August 8, 1913. Serial No. 783.66%.

To all 7l/t()l)l 'it'mug concern lie it known that l, FRAXK Down, a citiaen ot the United States, residing at tl' leveland. in the county of (uyahoga and- State of Ohio, have invented certain new and. useful Improvements in ltolleuPlatens for 'lype-writing ivlachines, oi? which the Ltollowing is a speeiticatioi'i.

This invention has reference to an improvement in roller platens tor typewriting machines, and the object of the invention is to provide a platen or roll which is ma terially cheal'iened as compared with platens as hitherto made and also is improved in character because it is compartmcnted throughout with dead. air spaces and walls between said. spaces which will not transmit sound. all substantially as shown and the described and particularly pointed out in the claims.

in the accompanying drawings. l igure l is an elevation ot the roll or platen partly sectioned away at one end to disclose inside construetimi. Fig. 3 is a sectional elevation of one end of a modilied term of the platen, and Fig. 23 is a sectional elevation ot one end of still another modilication thereof.

The essential principle of the roll or platen thus shown is. to have dead air spaces or compartmentsdistributed throughout the body thereof from end to end and to occupy as much of the roll as possible consistent with suitable sustaining: walls tor the corering or shell for said spat-em whereby the sounding board or drum ctl'eet is overcome or avoided and the stroke of the keys is deadened as nearly as possible in a roll of this kind. To these ends l build the platen in any one of the several styles shown, or their equivalent.

in Fig. l the platen constructed with a core or body ol wood having solid ends 2 and a succession of what may be termed disks or division walls 2-3 at intervals, the space between said disk! being greater somewhat than. the thickness of the disks, or thereabout, the idea being to'have as much air space as possible and at the same time provide sullieient wall support for the shell ol the loll lo keep the roll or platen even and tirm on its working surface. The said disks. so-ealled. are developed by sawing out the stock between them down to the core proper iiidieated by --t-, which has a bore centrally lengthwise through the same from end to end occupied by a shaft :4 on

which the platen as a whole mounted. The spaces between the several disks constitute so many dead air spaces. chambers or compartments, and there is no communication between them. It key may therefore strike over any one of said spaces or compartments and there will be no sound transmitted to an adjacent compartment. If the key strikes over one ol the disks 2) there will be no sound to either side because of the dead chambers or spaces at the sides through which sound will not carry, and thus as a platen is produced which is practically sound proot and at the same time exceedingly simple and economical in its makeup.

The cover or inelosing portion as such may be of any suitable material. as, for example. an inner sleeve or cylinder 0 of aluminum. or fabric, or metal and fabric, and an outer tube or cover 5 of a suitable grade and hardness of rubber especially manufactllred for this purpose. The rubber employed in platens in everyday use on various makes of machines may be used for this purpose. and while such rubber will resist continuous liannucring by the keys for a long period of time it is a practically dead element when engaged over the inner sleeve 0 and the eonipurtniented body within the same as shown and described herein. The same is true as to each and all the forms of the platen comprised in my invention. 'lhus. in 1*"iggf. Q, I show a body with spirally disposed division walls (3 spaced apart relal'vely as in Fig.1 and running continuously from end to end of the roll. The dead air spaces llt'tWLLll these walls operate in ll' el; as the like spaces between the walls :3 in Fig. l. in Fig. ii the body of the platen likewise is preferably made of wood and cut with radially disposed walls H lengthwise terminating; at the heads :2. The said walls are spaced apart by intervening air spaces alternately disposed with the said walls d oanli space or compartment is (Jo-extensive with the said body between the solid ends The construction in Fig. 3 has the material advantage of always bringing the stroke ol the keys upon or over the (lead air pockets. and this result is obtained by mak-' ing; the teeth 7 coincident with the said air spaces, the said teeth determining; the stopping points of the roll and the measure of ti'irward n'iovement tin-rent. It follows that,

the stroke of the keys always comes between series of radially disposed walls integral the ribs or Walls. With said core and extending lengthwise in \Vhat 1 claim is: parallel lines and said Walls divided one 1. A platen. for typewriting machines from the other by dead air spaces their en- 20 k 5 having a core of Wood and a series of intire depth, an inner tube sleeved upon said teglal walls radiating from said core, said walls and an outside tube sleeved on said walls having dead air spaces between them inner tube, the said body having solid end. their full depth to said core and said spaces portions closing said dead air spaces at their separated by said walls the'said core havends. 25 10 ing a bore loiiigiizudinally through the center In testimony Wheneoi' I afiix my signature thereof, a shaft fixed in said bore and end in presence of two Witnesses.

sumorts for said cere havin tubular ex- 1 teiis ions sleeved over said 5153a. URANKDUWD' A platen for typewriters having a body Witnesses:

l5 consrrueied with a eore provided with a 'lF. G. MUssIEN,

bore lengizhwise through the same and a E. M. FISHER. 

